Small
·
2021
·Vol. 17
·期 46
·2103374
·
IF 13.281
Xiaowei Yu,Kaikai Liu,Hongyue Zhang,Bolun Wang,Wenyan Ma,Jiyang Li,Jihong Yu
Multilevel luminescence materials have aroused wide attention for their advanced anti-counterfeiting abilities. However, various complicated stimuli factors involved in multilevel luminescence anti-counterfeiting (MlLA) limit the practical applications of such materials. Herein, carbon dots (CDs) are in situ introduced into Eu-substituted AlPO 4 -5 zeolite (named CDs@EuAPO-5) via a solvent-free thermal crystallization method, which exhibits triple emissions including pink fluorescence mainly associated with Eu 3+ in the zeolite framework, blue fluorescence and green room temperature phosphorescence (RTP) associated with CDs. CDs are uniformly embedded in the EuAPO-5 zeolite matrix. Such composite displays excellent photo-, thermo-, and solvent resistance, as well as long-term storage-stability. Moreover, the triple emissions of the composite only need two kinds of common excitation lights to trigger, without involving other complicated stimuli. A triple-level luminescence anti-counterfeiting (TlLA) label has been built, realizing facile, quick, and advanced luminescence anti-counterfeiting that is hard to copy.
研究领域:
材料科学
·
光学
·
防伪技术
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 14
·4684-4692
·
IF 5.721
Pilan Zhang,Jie Yang,Hualei Hu,Danxin Hu,Jiang Gan,Yexin Zhang,Chunlin Chen,Xiaoqiang Li,Lei Wang,Jian Zhang
The self-etherification of 5-hydroxymethylfurfural (HMF) to 5,5′(oxy-bis(methylene))bis-2-furfural (OBMF) was investigated on ZSM-5, MCM-22, beta and hierarchical micro–mesoporous ZSM-5 (HMZ) catalysts. The hierarchically structured zeolites exhibited a superior intrinsic activity and good resistance to carbonaceous deposit; the latter could be ascribed to the lower mass transfer barrier in the mesopores of the HMZ catalysts. The structure–activity correlation showed that the catalytic activity mainly originated from one or several specific Brønsted acid sites, providing key clues to design efficient zeolite catalysts for producing OBMF.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·564-574
·
IF 1.712
Song Baodong,Li Yongqiang,Cao Gang,Sun Zhenhai,Han Xu
In the transformation of methanol to gasoline (MTG), the selectivity to gasoline and the aromatic content in the produced gasoline are important factors. The catalytic activities of steam-treated and non-steam-treated nano-scale H-ZSM-5 (NHZ5) catalysts impregnated with Ag(I), Zn(II) or P(V) have been investigated in a continuous flow fixed bed reactor. The NH 3 -TPD results showed that after impregnation, the Ag/NHZ5, Zn/NHZ5 and P/NHZ5 catalysts contained comparatively more strong, medium-strong and weak acid sites, respectively. Treatment with steam decreased the number of acid sites in all the catalysts, but the pore volumes in the catalysts were larger which improved carbon deposition resistance resulting in prolonged lifetimes. After 6 h of MTG reaction, the selectivity to gasoline for the steam-treated catalysts,
\(Ag_{H_2 O} /NHZ5\) , \(Zn_{H_2 O} /NHZ5\) and \(P_{H_2 O} /NHZ5\) were 70.5, 68.4 and 68.7 wt-%, respectively, whereas their respective aromatic contents in the produced gasoline were 61.9, 55.4 and 39.0 wt-%. Thus \(P_{H_2 O} /NHZ5\) is the most promising catalyst for MTG applications which can meet the China IV gasoline standard that the amount of aromatics in gasoline should be less than 48 wt-%.
研究领域:
催化化学
·
能源化工
·
材料科学
·
表面科学
·
石油炼制
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xin Yu,Xiaoqing Dang,Shijie Li,Yu Li,He Wang,Kairui Jing,Haoyun Dong,Xia Liu
Metal-support interaction has a substantial influence on catalyst activity while little attention has been paid to it in the plasma catalytic system. Herein, the effect of support on the activity of CoMnO X -based catalysts was investigated for trichloroethylene removal by plasma catalysis, and CoMnO X /ZSM-5 exhibited the highest mineralization rate (36.93−94.24 %), HCl and Cl 2 yield (19.66−94.37 %), energy yield (63.29–29 g/kWh), as well as the lowest export ozone concentration (18.72–108.83 mg/m 3 ) under 6–10 kV. The excellent catalytic activity of CoMnO X /ZSM-5 was ascribed to the formation of abundant defects and oxygen vacancies , which was induced by the Si O Co/Mn hybridization promoting Co/Mn O bonds cleavage. CoMnO X /ZSM-5 also exhibited superior adsorption ability, large amount of Co 3+ , Mn 4+ and adsorbed oxygen species, high reducibility and suitable acidity. Moreover, CoMnO X /ZSM-5 maintained superior water-resistant ability and high catalytic activity after 50 h operation. The proposed TCE degradation mechanism suggested that the contribution of plasma active oxygen species was involved in TCE oxidation and oxygen cycle of catalyst. This work provides a novel strategy to design catalysts in plasma catalytic system.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2016
·Vol. 147
·期 2
·502-508
·
IF 2.294
Chen Yao,Liu Cheng-chao,Zhang Yu-hua,Zhao Yan-xi,Wei Liang,Wen Xiong,Zhao Xin,Li Jin-lin
Abstract Hierarchically ZSM-5 zeolite was prepared by alkali treatment. It was used as a support for a series of Co-based catalysts for Fischer–Tropsch synthesis with Fe, Ti, Ga or Zn as promoter. This series of catalysts were named Co/M-ZSM-5 (M = Fe, Ti, Ga or Zn). The catalysts were characterized by SEM, XRD, H 2 -TPR, and XPS, and the FTS catalytic performance of catalysts were compared. The character date revealed that the promoter changed the dispersion, reducibility and stability of Co. The addition of Zn and Ga increased the activity of catalysts, decreased the selectivity to CH 4 . The Ti promoted catalyst had the highest initial activity, but it deactivated rapidly. The suitable interaction between Co and the Fe-ZSM-5 result in the suitable dispersion and reduction. Thus Fe is the better promoter for the catalyst Co/ZSM-5. Graphical Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
FITOTERAPIA
·
2025
·
IF 2.6
Shiyu Li,Kai Xu,Shanpeng Ma,Xueying Qin,Li Jiang,Xiaohong Hou,Zibo Dong,Xun Gao,Lingling Huo
Currently, coronary heart disease (CHD) is prevalent worldwide, with its harmful impact second only to that of malignant tumors. A growing number of studies have confirmed that Choerospondias axillaris can significantly improve the therapeutic effect of CHD treatment and reduce the incidence of adverse reactions. However, its bioactive components and pharmacological mechanisms remain unclear. Based on a targeted fishing strategy, this study synthesized magnetic nanomaterials immobilized with 5-lipoxygenase (5-LOX) for screening and identifying 5-LOX inhibitors from the crude extract of Choerospondias axillaris . A total of 21 active components were identified and analyzed using ultra-high performance liquid chromatography-Q-Exactive Orbitrap tandem mass spectrometry (UHPLC-Q-Exactive Orbitrap-MS/MS). By comparing the screened active components with reported 5-LOX inhibitors, 9 novel 5-LOX inhibitors were discovered. Further molecular docking was performed on these 9 inhibitors, and the pharmacological activity of the selected ligands was verified using a 5-LOX inhibitor screening kit (fluorescence method).The compounds are ranked by activity from strongest to weakest: Lobetyolin (23.92 μM), Anhydroicaritin (29.55 μM), Narirutin(33.66 μM), Fisetin (47.28 μM) and Naringin(59.02 μM). This novel enzyme-immobilized targeted fishing technology is expected to efficiently and accurately screen bioactive components targeting different receptors from complex substrates.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2020
·
IF 2.734
Kai An,Huiting Kang,Lilei Zhang,Lianxiong Guan,Dating Tian
Biocompatible thermosensitive molecularly imprinted polymers (MIPs) based on konjac glucomannan was prepared by graft copolymerization of N -isopropyl acrylamide , a thermosensitive monomer , with konjac glucomannan, a natural polysaccharide . The products were characterized by various means. The MIPs possessed switchable thermal regulation on the recognition and delivery of 5-fluorouracil (5-Fu), an anticancer drug . The results of adsorption experiments showed that the MIPs had excellent adsorption capacity at a temperature below the lower critical solution temperature, and the MIPs could specifically recognize and adsorb 5-Fu with good selectivity, repeatability, and stability. The adsorption isotherms of MIPs were fitted by six isothermal models and the dual-site Langmuir- Freundlich model presented the best fit. In addition, the in vitro release properties of 5-Fu from the thermosensitive MIPs were evaluated in phosphate buffer solution and the cumulative release of 5-Fu at 25 °C was higher than that at 38 °C. The release curves were fitted by zero-order, first-order, and Higuchi kinetic equations, respectively, and the results showed that the release of 5-Fu complied with the Fick 's law. Compared with non-molecularly imprinted polymers, the MIPs could release 5-Fu continuously for a certain period with a good controlled release effect, indicating that they possess great prospects as drug delivery materials.
研究领域:
生物材料学
·
药物递送系统
✓ 已验证
DOI
高影响因子
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
·
2023
·
IF 5.6
Hao Zhou,Mengjiao Li,Hui Liu,Zheng Liu,Xuekun Wang,Shiben Wang
In this study, four series of piperazine derivatives were designed, synthesised and subjected to biological test, and compound 6a with potential antidepressant activity was obtained. An affinity assay of compound 6a with 5-hydroxytryptamine (serotonin, 5-HT)1A receptor (5-HT1AR) was undertaken, and the effects on the 5-HT level in the brains of mice were also tested. The results showed that compound 6a had the best affinity with 5-HT1AR (Ki = 1.28 nM) and significantly increased the 5-HT level. The expression levels of 5-HT1AR, BDNF, and PKA in the hippocampus were analysed by western blot and immunohistochemistry analyses. The results showed that the expression of 5-HT1AR, BDNF, and PKA in the model group was reduced compared to that of the control group, and compound 6a could reverse this phenomenon. Molecular docking was performed to investigate the interactions of the studied compound 6a with 5-HT1AR on the molecular level.
研究领域:
药理学
·
神经科学
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2021
·
IF 5.89
Yang Bin,Sun Yiwen,Fu Shouying,Xia Miaomiao,Su Yuan,Liu Chuan,Zhang Chunzhi,Zhang Dawei
Ribulose 5-phosphate (Ru5P) and guanosine 5′-triphosphate (GTP) are two key precursors of riboflavin, whereby Ru5P is also a precursor of GTP. Ribulose 5-phosphate 3-epimerase (Rpe) catalyzes the conversion of ribulose 5-phosphate into xylulose 5-phosphate. Inactivation of Rpe can reduce the consumption of Ru5P, enhancing the carbon flux toward riboflavin biosynthesis. Here we investigated the effect of mutation of rpe and other related genes on riboflavin production, physiological and metabolic phenotypes in Bacillus subtilis LY (BSLY). Introducing single nucleotide deletion (generated BSR) or nonsense mutation (generated BSRN) on the genomic copy of rpe, resulting in more than fivefold increase of riboflavin production over the parental strain. BSR process 62% Rpe activity, while BSRN lost the entire Rpe activity and had a growth defect compared with the parent strain. BSR and BSRN exhibited increases of the inosine and guanine titers, in addition, BSRN exhibited an increase of inosine 5′-monophosphate titer in fermentation. The transcription levels of most oxidative pentose phosphate pathway and purine synthesis genes were unchanged in BSR, except for the levels of zwf and ndk, which were higher than in BSLY. The production of riboflavin was increased to 479.90 ± 33.21 mg/L when ribA was overexpressed in BSR. The overexpression of zwf, gntZ, prs, and purF also enhanced the riboflavin production. Finally, overexpression of the rib operon by the pMX45 plasmid and mutant gnd by pHP03 plasmid in BSR led to a 3.05-fold increase of the riboflavin production (977.29 ± 63.44 mg/L), showing the potential for further engineering of this strain.
研究领域:
微生物学
·
生物技术
·
代谢工程
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Binbin Chen,Hong Tian,Zhen Zhou,Yanni Xuan,Zhijie Wang,Siying Liu
A combined pretreatment of straw was carried out using acid washing and torrefaction methods. Metal-modified HZSM-5 core–shell molecular sieves were prepared by loading Zn (2, 4, and 6 wt%) and Ni (6, 8, and 10 wt%) on HZSM-5 molecular sieves and introducing MCM-41 core–shell structure. PY-GC/MS and a tubular furnace were employed to study the effects of pretreatment conditions and catalysts on the product composition distribution during wheat straw catalytic pyrolysis. XRD, SEM, BET, TPD and ICP were used to characterize the catalyst performance. It was found that the combined acid washing and torrefaction pretreatment reduced the oxygenated compounds in the bio-oil from straw catalytic pyrolysis and increased the bio-oil yield to 29.37 %. The incorporation of modified catalysts promoted the deoxygenation, zwitterionization and aromatization reactions during the straw-catalyzed pyrolysis. The monometallic loading of 4%Zn/HZ and 8%Ni/HZ catalyzed acid washing and torrefaction straw pyrolysis resulted in 54.2 % and 57.06 % yields of MAHs and 42.86 % and 38.58 % yields of BTX in bio-oil, respectively.Compared with the monometallic loading, 4%Zn8%Ni/HZ further optimized the bio-oil compositional distribution, with a MAHs yield of 64.76 %, a BTX yield of 54.69 %, and a deoxygenation performance of 81.34%.MCM-41-coated HZSM-5 produces a large mesoporous structure with channels with sufficient transport capacity, accelerating the cleavage of various types of oxygen-containing compounds in the bio-oil into smaller molecules for better conversion into aromatics. The 4%Zn8%Ni/H@M catalyst achieved a MAHs yield of 72.68 % and BTX yield of 63.43 % in the bio-oil during pyrolysis of acid-washed and torrefied wheat straw, with oxygen removal efficiency reaching 85.37 %. Therefore, the combination of feedstock pretreatment and metal-modified core–shell HZSM-5 molecular sieve could synergistically optimize both compositional distribution and production yield of bio-oil derived from biomass pyrolysis.
研究领域:
催化化学
·
生物质能源
·
材料科学
·
环境工程
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
·
IF 4.952
Yu-Xi Liu,Yu-Ying Zhang,Jie Zheng,Jia-Nan Chen,Xu-Hui Huang,Xiu-Ping Dong,Bei-Wei Zhu,Lei Qin
Scallop is popular for its delicious taste and rich nutrition value. This study investigated the metabolomic changes in free amino acid (FAA), 5′-nucleotide, and lipid composition of scallops collected in different seasons. Results showed that the content of the FAA and 5′-nucleotide in summer was significantly higher than in other seasons. Adenosine 5′-monophosphate, glycine, and alanine were dominant from June to August. A total of 176 lipids, including 50 triacylglycerols (TAG), 60 phosphatidylcholines (PC), and 30 phosphatidylethanolamines (PE), were identified in the scallop adductor muscle. PC and PE were dominant from February to June, and TAG was dominant in November. The unsaturation degree of TAG was increased from July to November, and the highest proportion of polyunsaturated phospholipids appeared in August and September. Overall, scallops have high nutritional value in summer. This study is helpful for the development of scallop products with high nutrition and high value.
研究领域:
海洋生物学
·
食品科学
·
代谢组学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Yuchen Zhu,Hao Wu,Zheng Fang,Xiaobing Yang,Kai Guo,Wei He
Cobalt (II)-meso-tetra(4-carboxyphenyl) porphyrin supported by deprotected lignin was synthesized through the covalent linkage between carboxy groups in the porphyrin and hydroxyl groups in the lignin. The resulting supporting catalysts were applied in the selective oxidation of 5-hydroxymethylfurfural. Through solvent optimization, 5-hydroxymethyl-2-furancarboxylic acid and 2,5-furandicarboxylic acid could be selectively obtained. Steric effect of lignin prevented unwanted aggregation-caused quenching, avoiding catalyst deactivation. Thus, supported catalysts displayed better catalytic efficiency compared free metal porphyrin catalyst. Unlike the excessive use of sodium hydroxide in the oxidation of HMF catalyzed by metal catalysts, an equivalent amount of sodium hydroxide was used in this oxidation process. Meanwhile, lower activation energy was detected when metal porphyrin supported by deprotected lignin was used. By adjusting the pH in the reaction, supported catalysts could be reused. The catalytic activity remained stable during the recycling experiments.
研究领域:
化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）